Across the span of Carl F. Gould's career in Seattle (1908-1939), architectural design moved from eclectic adaptations of historical models to the adoption of regional and nontraditional styles espoused by the Modern movement, and his buildings fully reflect this range of expression. Gould's design for the Seattle Art Museum was the first art museum in the country to be built in the modern style. His design development drawings for the museum are unique among those in the Gould collection for their precise dating. They reveal the design sequence from his earliest neoclassical efforts to his final modern solution. (Although Bebb remained Gould's partner and business adviser until the latter's death, after 1924 his influence in the firm declined substantially.) Interior gallery and public spaces were emphasized by use of colored natural materials in red, green and black, accented by gold and aluminum. The lower levels housed administrative spaces, library, auditorium, facilities, delivery area and art storage.